board: samsung: add support for Galaxy A series of 2017 (a5y17lte)

Samsung Galaxy A3, A5, A7 (2017) - middle class Samsung smartphones.
U-boot can be used as chain-loaded bootloader to gain control
on booting vanilla linux(and possibly others) kernels

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/doc/board/samsung/index.rst b/doc/board/samsung/index.rst
new file mode 100644
index 0000000..c904372
--- /dev/null
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+.. SPDX-License-Identifier: GPL-2.0+
+
+Samsung
+========
+
+.. toctree::
+   :maxdepth: 2
+
+   axy17lte